canvas{
    display: block;
    margin: 50px auto;
    box-shadow: -2px -2px 2px #EFEFEF, 5px 5px 5px #B9B9B9;
}
.restart{
    text-align: center;
}
.restart>span{
    display: inline-block;
    padding: 10px 20px;
    color: #fff;
    background-color: #C92027;
    border-radius: 5px;
}